病因

人数(n = 194)

NRDS

30 (15.5%)

围产期因素

85 (43.8%)

免疫因素

15 (7.7%)

NEC

8 (4.1%)

DIC

8 (4.1%)

染色体异常

4 (2.1%)

败血症

21 (10.8%)

其它原因

23 (11.8%)